Convert UtilityProcessHost to bootstrap Mojo Channel using the Shell connection

content/public/common/child_process_host.h

Index: content/public/common/child_process_host.h
diff --git a/content/public/common/child_process_host.h b/content/public/common/child_process_host.h
index 7fbac4c8f6f9b259f7a14eb1043c4c0a1cb1e49d..6f1543f19895f20a76474e2ae2ec0f01be778d3d 100644
--- a/content/public/common/child_process_host.h
+++ b/content/public/common/child_process_host.h
@@ -85,6 +85,11 @@ class CONTENT_EXPORT ChildProcessHost : public IPC::Sender {
   // succeeded, or an empty string on failure.
   virtual std::string CreateChannelMojo(const std::string& child_token) = 0;
 
+  // Creates the IPC channel on top of Mojo using |handle| as the bootstrap
+  // factory. Returns true if creation/initialization succeeded.
+  virtual bool CreateChannelMojoWithBootstrap(
+      mojo::ScopedMessagePipeHandle handle) = 0;
+
   // Returns true iff the IPC channel is currently being opened;
   virtual bool IsChannelOpening() = 0;